地热水与调峰锅炉联合供热在天津的应用

对地热水 燃气调峰锅炉供热系统在天津地区应用的资源优势及其设计思路、优点、应注意的问题进行了分析。结合工程实例,探讨了地热水 燃气调峰锅炉供热系统及监测控制方案。与燃气热水锅炉供热系统相比,地热水 燃气调峰锅炉供热系统的工程造价高、运行成本低、燃料费用低,经济性优。     

分布式二级循环泵供热系统的应用

介绍了分布式二级循环泵供热系统流程。结合工程实例，对分布式二级循环泵供热系统的设计及运行效果进行了分析。分布式二级循环泵供热系统的安全性及节能效果显著。     

供热系统节能改造实例解析

本文以北京市昌平区某区域锅炉供热系统的节能改造工程为例,对采用分布式变频二级泵的供热系统进行了广泛调研,并通过统计数据对节能效果进行了解析。所得结论为分布式变频二级泵循环系统在区域锅炉房供热模式中具有输送电耗少、锅炉运行压力低、管网水力稳定性好等诸多优点,符合国家节能减排政策的要求,是一种较为理想的供热循环方式,特别是在一定供热半径的情况下,可以取得良好的节能减排效果。     

330 MW机组配置电锅炉调峰容量确定分析

为了满足热电机组在供热期运行时要通过热电解耦，力争实现单日6 h最小发电出力达到40%额定负荷的调峰能力要求，提出供热机组配置电锅炉进行调峰的方案。以某330 MW机组为例，结合机组供热特性试验数据和设计供热工况图，绘制了机组的实际运行供热特性曲线，并以其中的最大抽汽工况曲线为依据，分别确定了不同供热面积和不同调峰目标下所需配置的电锅炉容量。结果表明：当单台机组对应供热面积分别为600万平方米、800万平方米和1000万平方米时，分别配置10.5 MW、40.6 MW、70 MW的电锅炉即可满足40%额定负荷调峰的要求；调峰目标每提高10%,所需配置电锅炉平均容量增大约21.5 MW,供热面积每增加100万平方米，所需配置的电锅炉容量增大约14 MW。该结果可为同类型机组进行电锅炉改造提供参考。     

水源热泵作为调峰热源的地热水供热系统

结合工程实例,介绍水源热泵(地热尾水作为低温热源)作为调峰热源的地热水供热系统流程,探讨供热系统的运行策略,对供热系统的造价及年运行费用进行了计算分析。     

微机控制对供热系统节能的影响

介绍某医院供热工程原运行情况,提出用工业微机自动控制供热系统的改造方案。比较改造前后的能耗和费用,说明该方案节能显著,且能在短期内收回投资。     

锅炉房二级循环泵供热系统的应用

介绍了二级循环泵供热系统基本原理和调节控制方式。比较了传统供热系统和二级循环泵供热系统的运行方式,结合工程实例,说明二级循环泵供热系统的耗电量比传统供热系统低。     

天然气锅炉烟气冷凝热回收利用技术工程应用方案探讨

在对不同用途天然气锅炉供热系统特点及烟气热回收节能率影响因素分析比较的基础上,结合烟气热回收装置的工程应用实例,探讨了热回收利用技术的应用方案,为正确设计选用烟气冷凝热回收利用装置、进行天然气锅炉供热系统节能设计和节能改造及供热系统运行调节提供参考.     

长输管道大温差供热回水温度的控制方案分析

为了促进长输管道供热回水温度控制效果的提升,文章主要分析和比较了三种不同供热系统方案的运作原理、优势和局限,阐述了供热系统在技术原理、运行费用、运行难易程度和工程改造造价等方面的内容,发现了隔压换热站吸收式换热机组直供系统在造价和工程量方面的优势.     

SCADA控制系统在供热节能工程中的应用

对SCADA控制系统在城市建筑供热工程中的应用进行了分析,结合实际项目案例,通过采用SCADA控制系统,达到了城市供热节能运行和智能监控的效果,降低了供热运营成本。     

Analysis of an effective solution to excessive heat supply in a city primary heating network using gas-fired boilers for peak-load compensation

Through investigation of the Dengfeng heating network in the city of Daqing, China, for the 2007-2008 heating season, we found serious problems of excessive heat supply in the primary heating network. Therefore, we propose the application of gas-fired boilers in underperforming heating substations as peak-load heat sources to effectively adapt to the regulation demands of seasonal heat-load fluctuations and reduce the excessive heat supply. First, we calculated the excessive heat supply rates (EHSRs) of five substations using detailed investigative data. We then discussed the feasibility of the proposed scheme providing energy savings from both energetic and exergetic points of view. The results showed that the average EHSR of the five substations between January and March was 20.57% of the gross heat production but consequently reduced to 6.24% with the installation of the gas-fired boilers. Therefore, the combined heating scheme with coal as the basic heat-source and gas-fired boilers as peak-load heat sources is energy-efficient to some extent, although requires the use of natural gas. Meanwhile, the exergy decreased by 10.97%, which indicates that the combined heating scheme effectively reduces the primary energy consumption and pollutant emission of the heating systems.     

某小区热计量改造节能诊断实测分析

为科学准确地了解要进行热计量节能改造的供热系统和建筑物能耗现状,针对某小区进行了节能诊断,分析了燃煤锅炉效率、补水率、循环水泵耗电情况、室外管网水力工况、室外管网热损失率、外围护结构热工缺陷、围护结构主体部位的传热系数、建筑外窗气密性和建筑物室内平均温度状况。根据实测数据,得到了既有供热系统和建筑物能耗水平与现行节能标准之间的差距,提出了节能改造的方案建议,分析了节能效益,为节能改造提供依据。     

锅炉供暖量化管理单片机监测系统的研制与应用

介绍了一种用于锅炉供暖量化管理的单片机监测系统，该系统监测锅炉运行中一系列供暖参数，监督指导司炉人员按需供热、计量烧煤、提高供热质量、降低能源消耗。３００多家用户使用表明，该系统效果良好。     

某热泵热水系统能耗及费用分析

对国内多所高校浴室供热用能方式进行调研。调研结果显示近半数公共浴室仍然采用燃煤锅炉制备热水。天然气资源有限和运行成本高的问题限制了"煤改气"政策的实施。因此对某高校学生浴室提出采用空气源热泵制取热水,从而降低运行费用的方案。对该热泵系统运行时间、运行效率、能源消费、运行费用和投资回收期等指标的计算表明,在15年的运行周期中,空气源热泵热水供应系统在全年大部分时间内可以完全取代传统燃气锅炉供热。其运行费用比燃气锅炉系统节约47%,具有良好的节能效果和经济效益。     

Opportunities for reversible chillers in office buildings in Europe

Europe with more than 600 millions of square meters of air-conditioned office buildings offers an opportunity to save energy and reduce CO₂ emissions by reconverting chillers into reversible heat pumps in office buildings. One of the questions asked in the framework of the IEA ECBCS Annex 48 is how to assess the energy saving potential and how to identify the most interesting building cases. The methodology proposed here is based on the simulation of office buildings representative of the building stock. The energy consumption has been simulated for different office building types in five European climatic zones on the one hand with boilers for heating and chillers for cooling, and on the other hand with reversible chillers plus back-up boilers. The results of the simulations in terms of energy consumption allow us to assess the primary energy savings and CO₂ emission reduction in Europe by reconverting chillers into reversible heat pumps. The results show that the potential of annual primary energy savings and annual CO₂ emission reduction are about 8 TWh_PE and 3 millions of tons of CO₂ in Europe-15. Even if the temperature level in terminal units can be solved using the cooling coil instead of the heating coil, a back up boiler turns generally out to be required for the coldest days in the year or when simultaneous heating and cooling demands occur.     

夏热冬冷地区办公建筑降低供暖空调能耗的技术路径

以上海地区某办公建筑为例,基于EnergyPlus能耗模拟,探讨了围护结构性能提升和暖通空调系统优化这2条节能技术路径对夏热冬冷地区办公建筑降低供暖空调全年能耗的有效性.结果 表明:围护结构性能提升的节能潜力较小,经济性较差;单纯提高围护结构保温隔热性能并不能保证降低建筑年耗冷量,应综合分析全年供热供冷能耗确定围护结构...     

An aquifer thermal storage system in a Belgian hospital: Long-term experimental evaluation of energy and cost savings

Over a three years period, an aquifer thermal energy storage system was monitored in combination with a heat pump for heating and cooling of the ventilation air in a Belgian hospital. The installation was one of the first and largest ground source heat pump systems in Belgium. Groundwater flows and temperatures were monitored as well as the energy flows of the heat pumps and the energy demand of the building. The resulting energy balance of the building showed that the primary energy consumption of the heat pump system is 71% lower in comparison with a reference installation based on common gas-fired boilers and water cooling machines. This corresponds to a CO₂-reduction of 1280 ton over the whole measuring period. The overall seasonal performance factor (SPF) for heating was 5.9 while the ATES system delivered cooling at an efficiency factor of 26.1. Furthermore, the economic analysis showed an annual cost reduction of k€ 54 as compared to the reference installation, resulting in a simple payback time of 8.4 years, excluding subsidies.     

Optimum design for reversible water–water heat pumps

The optimum energy consumption in an air conditioning system depends on many factors. Some of these are the following: the use of high performance devices, the utilization of these in the optimum efficiency range, a correct control strategy, a proper maintenance, etc.In air conditioning facilities most of the energy consumption corresponds to the thermal production, this being heat and cold. This thermal supply is commonly accomplished with boilers, chillers and heat pumps.In this article the efficiency of the reversible water–water heat pumps is analyzed, proposing a design that optimizes these elements. This improvement hardly requires modifications at manufacturing and operation levels, and it also contributes towards optimizing the energy consumption of these machines.     

Experimental investigations of a decentralized system for heating and hot water generation in a residential building

Nowadays, modern heat supply technologies are preferred by the decentralized municipal sector because they considerably reduce heat transfer losses. One such solution is a heating system using residential thermal stations (RTS). The advantages of a heating system with RTS, as compared with hot water storage vessels, include stabilizing heat costs, saving energy and a decrease in heat transfer losses.This paper presents the results of an experiment investigating heat consumption in a residential building using RTS. The building, located in Lublin, Poland, was supplied by the local district heating network. The energy consumption was monitored from April 2007 to April 2009. The efficiency of this system was 71.4% during the period when heat was required (winter) and 61.5% during the summer; an annual average efficiency of 67.1%. The energy consumption of the space heating system varied from 0.03 to 0.53 GJ m⁻² of the flat's surface area, with the average value being 0.22 GJ m⁻². The influences of the location of the flat within the building and the surface area of the flat on the quantity of heat required for space heating were analysed. Specific attention was paid to the occurrence of local heat flows between flats.     

热电冷联产系统节能性的(火用)分析

利用分析的方法,定义了等效发电效率,对常用热电冷联产系统形式的节能性进行了分析。认为相对于全国平均供电煤耗而言,热电冷联产系统的节能是有条件的,应选取合理的方式,优化设计和运行方案;相对于当前有些热电厂夏季负荷不足的情况,热电冷联产是节能的,在不同的情况下节能率在7.8%~39%之间。建议利用现有的热电联产条件,发展热电冷联产系统,提高现有热电厂的设备利用率和运行经济性。